My third day away on a business trip.Was focused on work until today.Messaged my girlfriend couple of times but never called her.She would call regularly though, trying check on me.Wasn't always available to answer. But today I didn't start working until 3pm so I talked to her for the best part of the morning.After we finished talking ,she stayed online and talked to someone for another hour or more.Called her once more before i went to work ,she said she talked to her girlfriend.I'm now back from work and she is not answering on home phone or her mobile.I have this horrible gut feeling she is doing something behind my back.I feel horrible and anxious.What do I do now?